The US Open is one of the four Grand Slam tennis tournaments which are held annually. This particular tournament is held in the United Stated on a hard court. The other Grand Slam tournaments have a range of surfaces. The US Open is held at the end of August every year and goes on two weeks into September. In the middle of the tournament is the Labour Day holiday. The US Open is owned by the United States Tennis Association, or USTA, which is a non profit organisation. All proceeds from the tournament go back into promoting tennis in the US.